<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Vue.set</title>
    <!-- 引入Vue -->
    <script type="text/javascript" src="../node_modules/vue/dist/vue.js"></script>
</head>
<body>
    <div id="root">
        <h2>学校名称：{{name}}</h2>
        <h2>学校地址：{{address}}</h2>
        <hr/>
        <button @click="addSex">添加一个性别属性，默认值是男</button>
        <h2>姓名：{{student.name}}</h2>
        <h2 v-if="student.sex">性别：{{student.sex}}</h2>
        <h2>年龄：真实{{student.age.rAge}}，对外{{student.age.sAge}}</h2>
        <h2>朋友们</h2>
        <ul>
            <li v-for="(f,index) in student.friends" :key="index">
                {{f.name}}--{{f.age}}
            </li>
        </ul>
    </div>
</body>
<script type="text/javascript">
    const vm = new Vue({
        el: '#root',
        data: {
            name: '尚硅谷',
            address: '北京',
            student: {
                name: 'tom',
                age: {
                    rAge: 40,
                    sAge: 29
                },
                friends: [
                    {name:'jerry', age:35},
                    {name:'tony',age:36}
                ]
            }
        },
        methods: {
            addSex(){
                // Vue.set(this.student, 'sex', '男');
                this.$set(this.student, 'sex', '男');
            }
        }
    })
</script>
</html>